References


Kilbane, C. R., & Milman, N. B. (2003). The digital teaching portfolio handbook: a how-to guide for educators. Boston: Allyn and Bacon.


Norman, Donald A. (2002). The Design of Everday Things. Double Day & Company Incorporated.


Shneiderman, Ben (2009). Designing the User Interface: Strategies for Effective Human-Computer Interaction (Fifth Edition). Addison-Wesley Publishers.


http://www.ratz.com/featuresbad.html